Obstetrics & Gynecology

The Mission of the Department of OB-GYN is to provide high quality medical care to both our Obstetric and Gynecological patients in a safe environment. The mission is guided by the values of caring, compassion and commitment to our diverse patient population.

The Department of OB-GYN provides all levels of inpatient and outpatient care and promotes women’s health through disease prevention, education and treatment. Services will be rendered to all of our patients regardless of severity of injury and illness, method of payment, race, ethnicity, national origin, gender, sexual orientation or religion.

Clinical Faculty

John C. Riggs, M.D.Chairman

Dr Riggs joined the Nassau University Medical Center in August 2015 as chairman of the OB/GYN Department.

Dr. John Riggs is originally from Haddonfield in southern New Jersey. He attended Georgetown University in Washington, D.C. for undergraduate and medical school education. He completed his residency in OB-GYN at St. Barnabas Medical Center in Livingston, New Jersey. From 1989-1999, he worked with his father, Joseph, in private practice in Haddon Heights, New Jersey where they specialized in Urogynecology, Pelvic Reconstructive Surgery, and Minimally Invasive Laparoscopic Surgery.

After his father/partner retired, Dr. Riggs moved to NYC and joined the staff of Wyckoff Heights Medical Center in Brooklyn. Over the next 15 years, he held multiple positions at Wyckoff: Director-Gynecology and Urogynecology, Director-Women’s Health Center, Chairman OB-GYN, President-Medical Staff, and President-Medical Board. He subsequently practiced for 3 years at Brooklyn Hospital in General OB-GYN.

Dr. Riggs is currently Clinical Chair-OB GYN at the American University-Antigua (AUA). He is also an active member of the AMA, ACOG, United Healthcare Credentials Committee, Georgetown University-Medical Alumni Board and Board of Governors. His interests include all sports, weightlifting, and traveling.

Dr. Maggie Tetrokalashvili is the Residency Program Director and Director of Infertility at NUMC. She performs minimally invasive operative laparoscopic techniques in managing the most complex infertility and gynecological problems.Dr. Tetrokalashvili earned her medical degree from I.M. Sechenov Moscow Medical Academy, Russia, and after that did her research fellowship at New York University Medical School. She completed the residency in Obstetrics and Gynecology at Mount Sinai School of Medicine and fellowship training in Reproductive Endocrinology and Infertility at Case Western Reserve University. She is also a graduate of APGO Academic Scholars and Leaders Program.She is an Assistant Professor at Stony Brook University School of Medicine and at New York Institute of Technology as well as Clinical Professor at American University of Caribbean, where she was previously elected as President of Faculty Senate

Lennox Bryson, MDDirector of Ambulatory Services

Dr. Bryson is a board certified physician who has 20 years of experience in Obstetrics & Gynecology.Dr. Bryson obtained his undergraduate degree from Stony Brook University and attended medical school at New York Medical College in Valhalla, NY. He completed his residency at NUMC where he has remained as an attending physician since 2000. Dr. Bryson enjoys seeing a multitude and diverse group of patients with obstetrical and gynecological needs in the inpatient and outpatient setting. Dr. Bryson is currently the Director of Ambulatory Services for the Women’s Health Center at NUMC.

Scott Stanislawski, MDDirector of Quality AssuranceMedical Student PreceptorDr. Stanislawski attended Black Hills State University in South Dakota and received a BS in Business Administration. He completed his medical training at Ross University School of Medicine in Dominica, West Indies. Dr. Stanislawski completed his residency in Obstetrics & Gynecology at NUMC where he was a chief resident and became an attending at NUMC after graduating in 2010.Dr. Stanislawski is currently the medical student preceptor for the Department of OB-GYN at Nassau University Medical Center and is Director of Quality Assurance.

Peter Hong, MDMaternal Fetal Medicine

Dr. Hong is a Board Certified obstetrician/gynecologist, specializing in Maternal-Fetal Medicine. He is the Chief of Obstetric Ultrasound and Antepartum Testing Unit and Asst. Professor in the Dept. of OB/GYN at NUMC. He performs comprehensive prenatal testing for maternal and fetal genetic screening. He treats all conditions complicating pregnancy and delivery.

Dr. Hong received his undergraduate degree from New York University and his medical degree from New York University School of Medicine. He completed a residency in OB/GYN at Downstate Medical Center/Kings County Hospital followed by a fellowship in Maternal-Fetal-Medicine at North Shore University Hospital in Manhasset, NY. Dr. Hong has been in practice for more than 34 years at various Medical Centers, including Long Island Jewish Medical Center, Queens Hospital and Downstate Medical Center. He is currently on staff and in practice at NUMC for more than 18 years.

Mary Fatehi, MDDirector of Gynecologic Oncology

Dr. Mary Fatehi joined our staff in May 2017 as Director of Gynecologic Oncology. A native North Carolinian, she has lived on Long Island with her family since 2003. She completed her undergraduate degree at Duke University and graduate degree at University of Minnesota at Duluth. She earned her MD with Honors from the University of North Carolina at Chapel Hill and continued her training to complete residency in Obstetrics and Gynecology at Columbia Presbyterian Medical Center and fellowship in Gynecologic Oncology at Yale New Haven Hospital. She is board certified in both of these specialty and subspecialty and has devoted her career to training young doctors in addition to providing quality patient care.

“As modern medicine becomes increasingly automated, I find that many times what is lost is the relationship between doctor and patient. I am committed to fully understand my patient’s needs and issues, and to empower her to maintain her best health. By developing a genuine relationship with patients, I am able help them navigate the stressful, often times confusing path through their care of complex gynecologic problems as well as diagnosis and treatment of gynecologic cancers. One of my particular assets is the ability to efficiently perform diagnostic office procedures to expedite diagnosis and treatment for symptomatic patients.”

Robert P. Griggs Jr., MDCo-Director of Obstetrics

Dr. Robert P. Griggs, Jr. joined the Obstetrics & Gynecology department at Nu Health Medical Center as Co-director of Obstetrics in August 2017. Dr. Griggs received his undergraduate training at Cornell University, and received his medical degree from University of Buffalo School of Medicine. Dr. Griggs completed his residency training at Lutheran Medical Center and Maimonides Medical Center in Brooklyn, New York. After completing his postgraduate training, Dr. Griggs has been a practicing physician in private practice in the East Meadow community for the past 28 years.

Dr. Griggs is Board Certified in Obstetrics & Gynecology, and brings a wealth of clinical experience to the department. Dr. Griggs is also Clinical Assistant Professor at the Donald and Barbara Zucker School of Medicine at Hofstra University, and is actively engaged in the teaching of residents and medical students. Dr. Griggs has been an Attending in Obstetrics and Gynecology at Winthrop University Hospital, Mercy Medical Center, and South Nassau Communities Hospital. Dr. Griggs also serves as Honorary Police Surgeon for the New York City and New York State Police Departments. Dr. Griggs has a special interest in obstetrical and gynecological ultrasound.

Godwin Onyeike, DOCo-Director of Obstetrics

Dr. Godwin Onyeike has recently joined the OBGYN staff at Nassau University Medical Center as Co-Director of Obstetrics. Dr. Onyeike is currently an Associate Clinical Professor of Obstetrics & Gynecology at Touro College of Osteopathic Medicine in Harlem, N.Y., Lake Erie College of Osteopathic Medicine, Lake Erie, Pennsylvania, and Ross University School of Medicine.

Dr. Onyeike attended St. John’s University in Jamaica, N.Y. and graduated with a BS in Pharmacy. He attended medical school at Philadelphia College of Osteopathic Medicine in Philadelphia, PA. He completed an internship at St. Michael’s Medical Center in Newark, N.J. and completed his residency in Obstetrics & Gynecology at St. Vincent’s Catholic Medical Center in Staten Island, N.Y.

Prior to joining the staff at NUMC, Dr. Onyeike served as the Residency Program Director of OBGYN at St. John’s Episcopal hospital in Far Rockaway, N.Y. Dr. Onyeike played a key role in converting the program into an ACGME program. Dr. Onyeike is very dedicated to promoting comprehensive women’s healthcare with a special interest in minimally invasive gynecologic surgeries and graduate medical education.

Martin Granoff, MDDirector of CME/Grand Rounds

Dr. Granoff is a Board Certified physician who has been active in Obstetrics & Gynecology for the past 20 years. He received his undergraduate degree from Stony Brook University and his Medical Degree from Stony Brook University School of Medicine.Dr. Granoff completed his internship and residency at NUMC. He provides comprehensive well-woman care and preventive medicine, diagnoses and treats gynecological problems, and complete obstetric care. Dr. Granoff is Director of CME and Grand Rounds at NUMC and also has a private office in East Northport, NY